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1. PF581 FUNCTIONAL HIGH-THROUGHPUT SCREENING FOR IDENTIFICATION OF NOTCH1 DOWNSTREAM EFFECTORS AS NOVEL THERAPEUTIC TARGETS IN MULTIPLE MYELOMA

Author: C.P. Ade, F. Ziouti, F. Jundt, D.S. Maichl, and S. Schmidt
Subjects: Downstream (manufacturing), Effector, High-throughput screening, medicine, Identification (biology), Hematology, Computational biology, Biology, medicine.disease, Multiple myeloma
Published: 2019

2. Notch and NF-κB Signaling Pathways in the Biology of Classical Hodgkin Lymphoma

Author: F Jundt and Rolf Schwarzer
Subjects: Regulation of gene expression, Notch signaling pathway, General Medicine, Biology, medicine.disease, Biochemistry, Lymphoma, Pathogenesis, medicine.anatomical_structure, Antigen, hemic and lymphatic diseases, Cancer research, medicine, Molecular Medicine, Signal transduction, Molecular Biology, Reprogramming, B cell
Abstract: Classical Hodgkin lymphoma (cHL) is now recognized as a B-cell-derived lymphoma which is characterized by only about 1% malignant pathognomonic Hodgkin and Reed-Sternberg (HRS) cells and an abundant infiltrate of reactive bystander cells. HRS cells are unique with respect to their lost B-cell-specific gene expression pattern and recurrent genetic lesions. Aberrant activity of Notch signaling, a highly conserved developmental pathway, acts as a negative regulator of the B cell program in HRS cells and thereby contributes to their reprogramming. Another striking feature and the major pathogenetic mechanism in HRS cells is constitutive NF-κB activation. A number of aberrations that contribute to canonical NF-κB activity in HRS cells have been described such as genetic lesions, deregulated receptor signaling and Epstein-Barr virus (EBV) infection. The importance of Notch and NF-κB signaling for cHL pathogenesis, their potential cross-talk and implications for future therapeutic applications are being discussed.
Published: 2011

3. Quark–gluon plasma and color glass condensate at RHIC? The perspective from the BRAHMS experiment

Author: Bjørn Hallvard Samset, C. E. Jørgensen, J. Cibor, Calin Besliu, M. Mikelsen, F. Jundt, C. Chasman, Stephen Sanders, K. Hagel, I. S. Zgura, Anders Holm, D. R. Beavis, Catalin-Lucian Ristea, R. A. Scheetz, Oana Ristea, Borge Svane Nielsen, M. Germinario, Gunnar Løvhøiden, J. I. Jørdre, E. Enger, A. Makeev, Z. Majka, Ian Gardner Bearden, Trine Spedstad Tveter, P. Staszel, F. Videbæk, Y.K. Lee, R. Wada, A. K. Holme, Dieter Røhrich, Zhongbao Yin, B. Neumann, J. J. Gaardhøje, E. Jakobsen, Jongmin Lee, Michael Murray, B. Budick, Al. Jipa, D. Sandberg, S. Lindahl, R. R. Debbe, H. Ito, Peter Christiansen, I. Arsene, Christian Holm Christensen, E. J. Kim, Tomasz Kozik, R. Płaneta, Ole Hansen, R. Karabowicz, Fouad Rami, H. Bøggild, D. Ouerdane, J. B. Natowitz, T. M. Larsen, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and BRAHMS
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, FOS: Physical sciences, Plasma, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Color-glass condensate, Nuclear physics, Quark–gluon plasma, Energy density, Bibliography, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment (nucl-ex), Nuclear Experiment, Jet quenching
Abstract: We review the main results obtained by the BRAHMS collaboration on the properties of hot and dense hadronic and partonic matter produced in ultrarelativistic heavy ion collisions at RHIC. A particular focus of this paper is to discuss to what extent the results collected so far by BRAHMS, and by the other three experiments at RHIC, can be taken as evidence for the formation of a state of deconfined partonic matter, the so called quark-gluon-plasma (QGP). We also discuss evidence for a possible precursor state to the QGP, i.e. the proposed Color Glass Condensate., 32 pages, 18 figures
Published: 2005

4. RECENT RESULTS FROM THE BRAHMS EXPERIMENT AT RHIC

Author: Z. Yin, Z. Majka, B. Neuman, C. Ristea, Stephen Sanders, Borge Svane Nielsen, Gunnar Løvhøiden, J. I. Jørdre, Y. K. Lee, Christian Holm Christensen, H. Bøggild, P. Staszel, D. Ouerdane, I. Arsene, J. B. Natowitz, Calin Besliu, K. Hagel, Tomasz Kozik, H. Ito, Svein Lindal, Alexandru Jipa, D. Sandberg, B. Budick, M. Mikelsen, F. Jundt, Peter Christiansen, Ian Gardner Bearden, Dieter Røhrich, Trine Spedstad Tveter, Jongmin Lee, T. M. Larsen, R. R. Debbe, R. Lystad, R. Pł Aneta, I. S. Zgura, R. Karabowicz, Fouad Rami, Michael D. Murray, F. Videbæk, E. J. Kim, E. Enger, D. R. Beavis, A. Makeev, J. J. Gaardhøje, Oana Ristea, R. A. Sheetz, R. Wada, J. Cibor, C. Chasman, M. Germinario, Bjørn Hallvard Samset, C. E. Jørgensen, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Berndt Müller, Chung-I Tan, and BRAHMS
Subjects: Physics, Nuclear and High Energy Physics, High Energy Density Matter, Astronomy and Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic and Molecular Physics, and Optics, Charged particle, 25.75.-q, 25.75.Dw, Color-glass condensate, Nuclear physics, Reaction dynamics, Quark–gluon plasma, Particle, Rapidity, Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract: We present the results obtained by the BRAHMS experiment at the Relativistic Heavy Ion Collider (RHIC) for three colliding systems, namely: Au + Au , d + Au and p + p at [Formula: see text]. The main focus here is to give an overview of the main results on the reaction dynamics and on the properties of hot and high energy density matter produced in utra-relativistic heavy ion collisions. Measurement of particle production, particle spectra over a large rapidity interval as well as high pt measurements related to nuclear modification in Au + Au and d + Au collision are discussed. The observed number of charged particles produced per unit of rapidity at the central rapidity region indicates that a high energy density (> 5 GeV/fm3) system is created at the initial stage of the Au + Au reaction. From the particle spectra we deduced significant radial expansion (β ≈ 0.75) which is consistent with the large initial energy density. For Au + Au at η = 0 we observe the suppression of the high p T particles as compared to the elementary collisions, whereas for the d + Au reaction the Cronin type enhancement is observed. We also discuss to what extent these results can be taken as evidence for the quark gluon plasma (QGP). Finally, we present the nuclear modification effects in d + Au reaction as a function of rapidity and consider whether the observed suppression at forward rapidities constitutes sufficient evidence for a possible precursor state to the QGP, i.e. the Color Glass Condensate (CGC).
Published: 2005

5. Forward and midrapidity like-particle ratios from p+p collisions at s=200 GeV

Author: J. I. Jørdre, P. Staszel, Michael Murray, Ian Gardner Bearden, Stephen Sanders, H. Bøggild, D. Ouerdane, Dieter Røhrich, A. Wieloch, C. Chasman, K. Hagel, Gunnar Løvhøiden, M. Mikelsen, J. Cibor, F. Jundt, Y. K. Lee, D. Sandberg, M. Germinario, E. Jakobsen, Jongmin Lee, J. B. Natowitz, R. R. Debbe, Bjørn Hallvard Samset, K. Olchanski, D Rohrich, C. E. Jørgensen, A. K. Holme, Christian Holm Christensen, E. J. Kim, D. R. Beavis, Alexandru Jipa, F. Videbæk, E. Enger, Z. Majka, J. Norris, R. Płaneta, JI Jordre, Peter Christiansen, R. A. Scheetz, I. S. Zgura, H. Ito, Anders Holm, R. Karabowicz, Fouad Rami, J. J. Gaardhøje, B. Budick, T. Keutgen, A. Makeev, T. M. Larsen, Tomasz Kozik, Calin Besliu, R. Wada, Z. Yin, Trine Spedstad Tveter, C. Ristea, and Borge Svane Nielsen
Subjects: Baryon, Physics, Nuclear and High Energy Physics, Transverse momentum, Theoretical models, Rapidity, Baryon number, Atomic physics, Rest frame, Beam energy
Abstract: We present a measurement of π − / π + , K − / K + and p ¯ / p from p + p collisions at s = 200 GeV over the rapidity range 0 y 3.4 . For p T 2.0 GeV / c we see no significant transverse momentum dependence of the ratios. All three ratios are independent of rapidity for y ≲ 1.5 and then steadily decline from y ∼ 1.5 to y ∼ 3 . The π − / π + ratio is below unity for y > 2.0 . The p ¯ / p ratio is very similar for p + p and 20% central Au + Au collisions at all rapidities. In the fragmentation region the three ratios seem to be independent of beam energy when viewed from the rest frame of one of the protons. Theoretical models based on quark–diquark breaking mechanisms overestimate the p ¯ / p ratio up to y ≲ 3 . Including additional mechanisms for baryon number transport such as baryon junctions leads to a better description of the data.
Published: 2005

6. Rapidity dependent strangeness measurements in BRAHMS experiment at RHIC

Author: J H Lee, (for the BRAHMIS Collaboration), I G Bearden, D Beavis, C Besliu, B Budick, H Bøggild, C Chasman, C H Christensen, P Christiansen, J Cibor, R Debbe, E Enger, J J Gaardhøje, M Germinario, K Hagel, O Hansen, A Holm, H Ito, E Jakobsen, A Jipa, F Jundt, J I Jørdre, C E Jørgensen, R Karabowicz, E J Kim, T Kozik, T M Larsen, Y K Lee, G Løvhøiden, Z Majka, A Makeev, M Mikelsen, M Murray, J Natowitz, B S Nielsen, J Norris, K Olchanski, J Olness, D Ouerdane, R P aneta, F Rami, C Ristea, D Röhrich, B H Samset, D Sandberg, S J Sanders, P Staszel, T S Tveter, F Videbæk, R Wada, A Wieloch, Z Yin, and I S Zgura
Subjects: Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Pion, Meson, Hadron, Transverse mass, Rapidity, Strangeness, Nuclear Experiment, Charged particle
Abstract: Particle production of charged kaons in central Au+Au collisions at has been studied as a function of rapidity by the BRAHMS collaboration at RHIC. The kaon spectral shapes are described well by an exponential in transverse mass for the rapidity range of 0 ≤ yK ≤ 3.3 with smoothly decreasing inverse slopes as the rapidity increases. For the charged kaon to pion ratios, while there is no significant rapidity dependence for the K+/π+ ratio, the K−/π− ratio shows a significant decrease from y ≈ 1 towards higher rapidities. The systematics of K−/K+ and ratios in the measured rapidity range demonstrates a strongly correlated behaviour which can be described by thermal–statistical models.
Published: 2003

7. The BRAHMS experiment at RHIC

Author: F. Jundt, L. Dutka, L Antvorskov, M Kajetanowicz, Borge Svane Nielsen, E. Jakobsen, Jongmin Lee, Zbigniew Sosin, M Adamczyk, J. Westergaard, T. Keutgen, A. Makeev, D. R. Beavis, K Ashktorab, Christian Holm Christensen, E.K. Olsen, B. Budick, P. Staszel, R. Planeta, R. A. Scheetz, F. Videbæk, Michael Murray, Z. Majka, Tomasz Kozik, K. Hagel, J. Hammond, Gunnar Løvhøiden, Dieter Røhrich, K. Grotowski, T. M. Larsen, Bjørn Hallvard Samset, Y. Blyakhman, J. Brzychczyk, H. Bøggild, E. Baker, Al. Jipa, D. Ouerdane, J. B. Natowitz, R. Wada, H. Ito, R. Debbe, A. K. Holme, C. E. Jørgensen, E. J. Kim, J Sørensen, E Kotula, Calin Besliu, N. Lindegaard, Peter Christiansen, I. S. Zgura, K. Olchanski, C. Pearson, O.B. Rasmussen, Anders Holm, J. J. Gaardhøje, J. Cibor, A. Wieloch, Trine Spedstad Tveter, K Pena, K. Asselta, Ole Hansen, Y. K. Lee, C. Chasman, J Engelhardt, D. Phillips, E McBreen, J. I. Jørdre, H Diaz, M Justice, Ian Gardner Bearden, J.W. Olness, Fouad Rami, J.C. Hansen, T.F. Thorsteinsen, and Stephen Sanders
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Physics::Instrumentation and Detectors, Tracking (particle physics), Particle identification, Nuclear physics, Momentum, Quark–gluon plasma, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Instrumentation, Event (particle physics), Cherenkov radiation
Abstract: The BRAHMS experiment at RHIC was conceived to pursue the understanding of nuclear matter under extreme conditions by detailed measurements of charged hadrons over the widest possible range of rapidity and transverse momentum. The experiment consists of two spectrometers with complementary charged hadron detection capabilities as well as a series of global detectors for event characterization. A series of tracking detectors, time-of-flight arms and Cherenkov detectors enables momentum determination and particle identification over a wide range of rapidity and transverse momentum. Technical details and performance results are presented for the various detector subsystems. The performance of the entire system working together is shown to meet the goals of the experiment.
Published: 2003

8. Results from the BRAHMS experiment at RHIC

Author: D R$ouml$hrich for the BRAHMS Collaboration, I G Bearden, D Beavis, C Besliu, Y Blyakhman, J Brzychczyk, B Budick, H B$oslash$ggild, C Chasman, C H Christensen, P Christiansen, J Cibor, R Debbe, J J Gaardh$oslash$je, M Germinario, K Grotowski, K Hagel, O Hansen, A Holm, A K Holme, H Ito, E Jakobsen, A Jipa, J I Jordre, F Jundt, C E J$oslash$rgensen, T Keutgen, E J Kim, T Kozik, T M Larsen, J H Lee, Y K Lee, G L$oslash$vh$oslash$iden, Z Majka, A Makeev, B McBreen, M Murray, J Natowitz, B S Nielsen, K Olchanski, J Olness, D Ouerdane, R P$lslash$aneta, F Rami, D R$ouml$hrich, B Samset, D Sandberg, S Sanders, R A Sheetz, Z Sosin, P Staszel, T F Thorsteinsen, T S Tveter, F Videb$aelig$k, R Wada, A Wieloch, and I S Zgura
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Antiproton, Pseudorapidity, Rapidity, Multiplicity (chemistry), Relativistic Heavy Ion Collider, Charged particle, Late summer
Abstract: Results from the BRAHMS Collaboration for the inaugural physics run with the relativistic heavy ion collider (RHIC), Au + Au collisions at √sNN = 130 GeV in the late summer of 2000, and some results of the very first data from the summer of 2001 at √sNN = 200 GeV are presented. Here the main focus is on the determination of the pseudorapidity distribution of charged particles as a function of collision centrality and on the measurement of the antiproton to proton and the K− to K+ ratios as a function of rapidity. The pseudorapidity density at midrapidity reaches dN(ch)/dη = 553 ± 36 for the most central collisions (0–5%) at √sNN = 130 GeV; the corresponding number for a higher energy is dN(ch)/dη = 632 ± 36, demonstrating an increase in multiplicity of about 14%. The measured antiproton/proton ratios peak at midrapidity around N()/N(p) = 0.64 ± 0.06 and drop to 0.41 ± 0.04 at y ≈ 2 for √sNN = 130 GeV reactions; the K− to K+ ratios are 0.90 ± 0.06 (y ≈ 0) and 0.83 ± 0.1 (y ≈ 2.5).
Published: 2002

9. Notch pathway inhibition controls myeloma bone disease in the murine MOPC315.BM model

Author: R Schwarzer, N Nickel, J Godau, B M Willie, G N Duda, B Cirovic, A Leutz, R Manz, B Bogen, B Dörken, and F Jundt
Subjects: Cancer Research, medicine.medical_specialty, Bone disease, Notch signaling pathway, Medizin, Apoptosis, Enzyme-Linked Immunosorbent Assay, Disease-Free Survival, Mice, Random Allocation, Osteoclast, Internal medicine, Cell Line, Tumor, medicine, Animals, Humans, ddc:610, Receptor, Multiple myeloma, Mice, Inbred BALB C, biology, Receptors, Notch, Cell Differentiation, Hematology, Dipeptides, medicine.disease, Xenograft Model Antitumor Assays, Disease Models, Animal, Endocrinology, medicine.anatomical_structure, Oncology, Cell culture, RANKL, Cancer research, biology.protein, Female, Original Article, Bone Diseases, Multiple Myeloma, Signal Transduction
Abstract: Despite evidence that deregulated Notch signalling is a master regulator of multiple myeloma (MM) pathogenesis, its contribution to myeloma bone disease remains to be resolved. Notch promotes survival of human MM cells and triggers human osteoclast activity in vitro. Here, we show that inhibition of Notch through the γ-secretase inhibitor XII (GSI XII) induces apoptosis of murine MOPC315.BM myeloma cells with high Notch activity. GSI XII impairs murine osteoclast differentiation of receptor activator of NF-κB ligand (RANKL)-stimulated RAW264.7 cells in vitro. In the murine MOPC315.BM myeloma model GSI XII has potent anti-MM activity and reduces osteolytic lesions as evidenced by diminished myeloma-specific monoclonal immunoglobulin (Ig)-A serum levels and quantitative assessment of bone structure changes via high-resolution microcomputed tomography scans. Thus, we suggest that Notch inhibition through GSI XII controls myeloma bone disease mainly by targeting Notch in MM cells and possibly in osteoclasts in their microenvironment. We conclude that Notch inhibition is a valid therapeutic strategy in MM.
Published: 2014

10. Charged particle densities from Au+Au collisions at =130 GeV

Author: I.G Bearden, D Beavis, C Besliu, Y Blyakhman, J Brzychczyk, B Budick, H Bøggild, C Chasman, C.H Christensen, P Christiansen, J Cibor, R Debbe, J.J Gaardhøje, K Grotowski, K Hagel, O Hansen, A Holm, A.K Holme, H Ito, E Jakobsen, A Jipa, J.I Jørdre, F Jundt, C.E Jørgensen, T Keutgen, E.J Kim, T Kozik, T.M Larsen, J.H Lee, Y.K Lee, G Løvhøiden, Z Majka, A Makeev, E McBreen, M Murray, J Natowitz, B.S Nielsen, K Olchanski, J Olness, D Ouerdane, R Płaneta, F Rami, D Röhrich, B.H Samset, S.J Sanders, R.A Sheetz, Z Sosin, P Staszel, T.F Thorsteinsen, T.S Tveter, F Videbæk, R Wada, A Wieloch, and I.S Zgura
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Pseudorapidity, Particle, High Energy Physics::Experiment, Rapidity, Multiplicity (mathematics), Nuclear Experiment, Nucleon, Scaling, Charged particle
Abstract: We present charged particle densities as a function of pseudorapidity and collision centrality for the 197Au+197Au reaction at sqrt{s_{NN}}=130 GeV. An integral charged particle multiplicity of 3860+/-300 is found for the 5% most central events within the pseudorapidity range -4.7
Published: 2001

11. The STAR Time Projection Chamber

Author: K.H. Ackermann, N. Adams, C. Adler, M. Aluyshin, M.A. Ananeva, M. Anderson, G. Averichev, A. Bacher, J. Balewski, O. Balrannikova, J. Baudot, S. Bekele, R. Bellwied, S. Bennett, J. Berger, W. Betts, H. Bichsel, F. Bieser, L. Bland, C. Blyth, A. Bogdanov, B.E. Bonner, R. Bossingham, A. Boucham, S. Bouvier, F.P. Brady, E. Braithwaite, W. Braithwaite, R.L. Brown, V. Budilov, C. Byrd, H. Caines, N. Carlin, J. Carroll, D. Cebra, M.-L. Chen, W. Chen, Y. Chen, S. Chernenko, M. Cherney, A. Chikanian, J.T.M. Chrin, W. Christie, J.-P. Coffin, L. Conin, T.M. Cormier, J. Cramer, H.J. Crawford, A. Das, W. Deng, A.A. Derevschikov, L. Didenko, W. Dominik, J.E. Draper, V. Dunin, J. Dunlop, H. Dyke, W.R. Edwards, V. Eckardt, A.V. Efremov, V. Emelianov, J. Engelage, G. Eppley, B. Erazmus, A. Etkin, P. Fachini, V. Faine, M.I. Ferguson, H. Fessler, E. Finch, Y. Fisyak, D. Flierl, K.J. Foley, D. Fritz, N. Gagunashvili, M. Germain, V. Ghazikhanian, M. Gilkes, S. Giliberto, J. Grabski, O. Grachov, D. Greiner, L.C. Greiner, V. Grigoriev, E. Gushin, H. Gutbrod, T.J. Hallman, D. Hardtke, J.W. Harris, M. Heffner, S. Heppelmann, A. Hirsch, E. Hjort, G.W. Hoffmann, M. Horsley, H. Huang, T. Humanic, H. Huemmler, T. Huyck, G.J. Igo, Yu.I. Ivanshin, P. Jacobs, W. Jacobs, S. Jacobson, R. Jared, P. Jones, E.G. Judd, F. Jundt, M. Kaplan, V. Kaplin, D. Keane, V. Khodyrev, J. Klay, S. Klein, L. Kolobashkina, A. Konstantinov, L. Kotchenda, I. Kotov, M. Kramer, P. Kravtsov, C. Kuhn, G.J. Kunde, R. Kutuev, M. Lamont, J.S. Lange, B. Lasiuk, F. Laue, A. Lebedev, Z. Lee, T. LeCompte, B. Leonhardt, V. Leontiev, null Leszczynski, M.J. LeVine, Q. Li, Z. Li, C.J. Liaw, J. Lin, S.J. Lindenbaum, H. Liu, M. Lisa, A. Ljubicic, W. Llope, G. LoCurto, H. Long, R.S. Longacre, W.A. Love, J.R. Lutz, D. Lynn, L. Madansky, R. Majka, T.M. Makarenko, A. Maliszewski, S. Margetis, K. Marks, L. Martin, J. Marx, H.S. Matis, Yu. Matulenko, T.S. McShane, A. Meshanin, Yu. Melnik, A. Michalon, B. Miller, Z. Milosevich, N. Minaev, R.M. Minor, J. Mitchell, V.A. Moiseenko, D. Moltz, C.F. Moore, M.G. Munhoz, G.S. Mutchler, J.M. Nelson, P. Nevski, V. Nikitin, B. Nilsen, L. Nogach, S. Nurushev, J. Nystrand, G. Odyniec, A. Ogawa, C.A. Ogilvie, V. Okorokov, D. Olson, A. Oltchak, G. Ott, G. Paic, S. Pandey, Y. Panebratsev, S.Y. Panitkin, A. Pavlinov, T. Pawlak, W. Peryt, V. Perevoztchikov, V.A. Petrov, Yu. Petukhov, W. Pinganaud, E. Platner, J. Pluta, N. Porile, J. Porter, A.M. Poskanzer, M. Przewlocki, D. Prindle, E. Potrebenikova, C. Pruneau, G. Rai, O. Ravel, R.L. Ray, D. Razin, S. Razin, J. Reid, F. Retiere, A. Ridiger, J. Riso, H.-G. Ritter, J.B. Roberts, D. Roehrich, O. Rogachevskiy, A. Rollefson, J.L. Romero, C. Roy, M. Runco, D.E. Russ, V. Rykov, I. Sakrejda, P. Saltz, J. Sandweiss, A.C. Saulys, I. Savin, J.J. Schambach, R.P. Scharenberg, N. Schmitz, L.S. Schroeder, A. Schuettauf, M. Schulz, J. Seger, D. Seliverstov, J. Seyboth, P. Seyboth, A. Shalnov, K. Shestermanov, Y. Shi, V.S. Shvetsov, I.N. Silin, N. Smirnoff, R. Snellings, L. Soloviev, J. Sowinski, H.M. Spinka, B. Srivastava, E. Stephenson, R. Stock, M. Strikhanov, B. Stringfellow, H. Stroebele, C. Struck, E. Sugarbaker, C. Suire, A. Sustich, T.J. Symons, E.M. Szanto, A. Szanto de Toledo, J. Takahashi, A. Tang, D. Thein, J.H. Thomas, V. Tikhomirov, V. Tikhonov, M.B. Tonjes, T. Trainor, S. Trentalange, M. Tokarev, V. Trofimov, O. Tsai, C. Tull, K. Turner, T. Ullrich, D.G. Underwood, G. VanBuren, A.M. VanderMolen, A. Vanyashin, A. Vasiliev, I.M. Vasilevski, S. Vigdor, S. Voloshin, C.Q. Vu, F. Wang, H.J. Ward, D. Weerasundra, R. Wells, T. Wenaus, G.D. Westfall, J.P. Whitfield, C. Whitten, H. Wieman, R. Willson, S. Wissink, R. Witt, L. Wood, N. Xu, Z. Xu, A. Yakutin, E. Yamamoto, J. Yang, P. Yepes, A. Yokosawa, V. Yurevich, J. Zhang, W.M. Zhang, N. Zhidkov, D. Zimmerman, R. Zoulkarneev, A. Zubarev, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and STAR
Subjects: Physics, Nuclear and High Energy Physics, Time projection chamber, Physics::Instrumentation and Detectors, business.industry, 010308 nuclear & particles physics, Track (disk drive), Resolution (electron density), Observable, Star (graph theory), Engineering physics, 01 natural sciences, Particle identification, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Stars, 0302 clinical medicine, Optics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Data analysis, Nuclear Experiment, business, 010306 general physics
Abstract: The STAR Time Projection Chamber was successfully operated during the first RHIC run in 2000. Most of the STAR contributions reported in these proceedings are based on the analysis of data from the TPC. In this article, we show that the performance achieved by the TPC, in terms of track reconstruction, position resolution, and particle identification are well suited for measuring precise and reliable physics observables.
Published: 1999

12. Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV

Author: M. Eskef, D. Pelte, G. Goebels, E. Häfele, N. Herrmann, M. Korolija, Y. Leifels, H. Merlitz, S. Mohren, M.R. Stockmeier, M. Trzaska, J.P. Alard, A. Andronic, R. Averbeck, Z. Basrak, N. Bastid, I. Belyaev, D. Best, A. Buta, R. Čaplar, N. Cindro, J.P. Coffin, P. Crochet, P. Dupieux, M. Dželalija, L. Fraysse, Z. Fodor, A. Genoux-Lubain, A. Gobbi, K.D. Hildenbrand, B. Hong, F. Jundt, J. Kecskemeti, M. Kirejczyk, R. Kotte, R. Kutsche, A. Lebedev, V. Manko, J. Mösner, D. Moisa, W. Neubert, M. Petrovici, C. Pinkenburg, C. Plettner, P. Pras, F. Rami, V. Ramillien, W. Reisdorf, J.L. Ritman, B. de Schauenburg, D. Schüll, Z. Seres, B. Sikora, V. Simion, K. Siwek-Wilczynska, V. Smolyankin, M.A. Vasiliev, P. Wagner, G.S. Wang, K. Wisniewski, D. Wohlfarth, and A. Zhilin
Subjects: Physics, Nuclear and High Energy Physics, Mass distribution, 010308 nuclear & particles physics, Resonance, Kinetic energy, 7. Clean energy, 01 natural sciences, Spectral line, Baryon, Nuclear physics, Pion, Isospin, 0103 physical sciences, Invariant (mathematics), Nuclear Experiment, 010306 general physics
Abstract: The mass distributions of baryon resonances populated in near-central collisions of Au on Au and Ni on Ni are deduced by defolding the $p_t$ spectra of charged pions by a method which does not depend on a specific resonance shape. In addition the mass distributions of resonances are obtained from the invariant masses of $(p, \pi^{\pm})$ pairs. With both methods the deduced mass distributions are shifted by an average value of -60 MeV/c$^2$ relative to the mass distribution of the free $\Delta(1232)$ resonance, the distributions descent almost exponentially towards mass values of 2000 MeV/c^2. The observed differences between $(p, \pi^-)$ and $(p, \pi^+)$ pairs indicate a contribution of isospin $I = 1/2$ resonances. The attempt to consistently describe the deduced mass distributions and the reconstructed kinetic energy spectra of the resonances leads to new insights about the freeze out conditions, i.e. to rather low temperatures and large expansion velocities.
Published: 1998

13. Time-scale and excitation energy partition in sequential binary decays induced by heavy-ion collisions at ≃6 MeV·A

Author: J. P. Coffin, G. Vannini, L. Vannucci, F. Jundt, P. Boccaccio, Peter Wagner, P. Fintz, I. Massa, G. Guillaume, R. A. Ricci, Fouad Rami, and R. Donà
Subjects: Physics, Nuclear and High Energy Physics, Reaction mechanism, Scale (ratio), Hadron, Partition (number theory), Binary number, Nuclear fusion, Atomic physics, Nuclear Experiment, Energy (signal processing), Excitation
Abstract: We studied the sequential binary decay of the systems 32S+45Sc, 76Ge, 89Y, 59Co, 63Cu and 19F+63Cu induced by collisions at ≃6 MeV·A. The two stages of the process have reaction-times compatible with the dynamics of different mechanisms. The study of the excitation energy partition shows that the reaction mechanism of the first step has influence on the de-excitation of the primary fragments producing two decay components which have different time scale.
Published: 1998

14. Stopping and radial flow in central58Ni+58Nicollisions between1Aand2AGeV

Author: C. Roy, J. Mösner, D. Wohlfarth, A. Genoux-Lubain, Vladislav Manko, C. Pinkenburg, A. Buta, Christian Claude Kuhn, G. Guillaume, Byung-Sik Hong, E. Häfele, James Ritman, B. Sikora, D. Best, W. Reisdorf, F. Jundt, V. Simion, P. Crochet, W. Neubert, S. Mohren, Mihai Petrovici, U. Sodan, Peter Wagner, J. Biegansky, B. de Schauenburg, A. Somov, Y. Leifels, A. Lebedev, T. Wienold, C. Maazouzi, V. Amouroux, Vasilev, A. Zhilin, R. Kotte, I. Belyaev, Fouad Rami, G.S. Wang, D. Pelte, L. Fraysse, Z. Seres, N. Herrmann, K. D. Hildenbrand, M. Eskef, J. P. Coffin, J. Kecskemeti, J. P. Alard, Pascal Dupieux, D. Schüll, P. Fintz, I. Legrand, M. Trzaska, M. Kirejczyk, L. Tizniti, G. Berek, K. Siwek-Wilczyńska, Nicole Bastid, G. Goebels, R. Dona, P. Pras, M. Korolija, Z. Fodor, and A. Gobbi
Subjects: Physics, Nuclear and High Energy Physics, Energy loss, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Quantum molecular dynamics, Nuclear physics, Nickel, chemistry, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Radial flow, Nuclear Experiment, 010306 general physics
Published: 1998

15. Out-of-plane emission of nuclear matter in Au+Au collisions between 100 and 800 AMeV

Author: D. Best, L. Fraysse, D. Wohlfarth, W. Neubert, U. Sodan, J. P. Wessels, M. Trzaska, N. Cindro, N. Herrmann, Z. Basrak, P. Fintz, C. Maazouzi, R. Čaplar, F. Jundt, P. Crochet, Y. Leifels, C. Pinkenburg, D. Moisa, Th. Blaich, S. C. Jeong, S. Hölbling, G. Guillaume, M. Dželalija, C. Cerruti, T. Wienold, Pascal Dupieux, B. Sikora, R. Dona, G. S. Wang, James Ritman, Mihai Petrovici, M. A. Vasiliev, J. Biegansky, G. Mgebrishvili, V. T. Smolyankin, P. Koncz, P. Pras, Y. Korchagin, Z. Seres, Z. G. Fan, Christian Claude Kuhn, Fouad Rami, K. M. Teh, V. Simion, J. P. Coffin, I. Belyaev, K. Siwek-Wilczyńska, C. Roy, J. Keczkemeti, M. Kirejczyk, Nicole Bastid, L. Tizniti, M. Krämer, D. Schüll, K. Wisniewski, A. Sadchikov, I. Legrand, B. Hong, P. Wagner, R. Kotte, D. Pelte, J. Mösner, W. Reisdorf, Vladislav Manko, A. Buta, R. P. Freifelder, A. Zhilin, V. Amouroux, K. D. Hildenbrand, E. Erö, A.L. Lebedev, J. P. Alard, Z. Fodor, and A. Gobbi
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Phase (waves), Charge (physics), Nuclear matter, Azimuth, Nuclear physics, Nuclear Reactions, Au-197 (Au-197, X), E=100-800 MeV/nucleon, Azimuthal anisotropy, Out-of-plane emission, Atomic physics, Nuclear Experiment, Anisotropy, Saturation (magnetic), Beam (structure)
Abstract: We present new experimental results concerning the azimuthal distributions of proton-likes, light and intermediate mass fragments at midrapidity for Au(100-800 AMeV)+Au collisions measured with the FOPI phase-I detector at GSI in Darmstadt. The azimuthal distributions are investigated as a function of the collision centrality, the incident energy, the fragment charge and transverse momentum. The azimuthal anisotropy is maximum for impact parameters around 7 fm. Intermediate mass fragments present a stronger out-of-plane emission signal than light fragments and a saturation is reached for Z greater than or equal to 4. The azimuthal anisotropy increases with the fragment transverse momentum and decreases as the incident energy increases. The azimuthal anisotropy of Z = 2 particles investigated as a function of the scaled fragment transverse momentum follows an universal curve for bombarding energies between 250-800 AMeV. A signature for a transition from in-plane to out-of-plane emission is evidenced at the lowest beam energies.
Published: 1997

16. Clustering in dissipative ternary processes induced in medium-mass systems

Author: I. Massa, R. A. Ricci, G. Vannini, F. Rami, P. Boccaccio, P. Fintz, J.P. Coffin, R. Donà, F. Jundt, L. Vannucci, P. Wagner, G. Giullaume, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette
Subjects: Physics, Library and information science, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], epistemology, Binary number, users, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Low energy, Fragmentation (mass spectrometry), Chemical physics, Dissipative system, Atomic physics, Cluster analysis, Ternary operation
Abstract: Ternary reactions, induced by low energy collisions (E ≃ 6A MeV), have been studied in the32S+45Sc,76Ge,89Y,59Co,63Cu and19F+63Cu systems. Both, sequential binary decay and fast disassembly of the system have been observed. Clustering effects influence the system fragmentation.
Published: 1997

17. Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration

Author: Y. Leifels, Christian Claude Kuhn, E. Häfele, D. Best, Mihai Petrovici, U. Sodan, G. Goebels, James Ritman, A. Gobbi, Peter Wagner, Z. Seres, R. Čaplar, J. Mösner, W. Reisdorf, Vladislav Manko, Y. Korchagin, V. T. Smolyankin, P. Pras, I. Belyaev, J. P. Coffin, A. Buta, D. Moisa, D. Wohlfarth, A. Genoux-Lubain, V. Ramillien, G. Guillaume, G.S. Wang, F. Jundt, P. Crochet, V. Simion, D. Lambrecht, A. Zhilin, C. Roy, M. Eskef, Z. Fodor, P. Koncz, V. Amouroux, R. Kotte, M. Kirejczyk, J. P. Alard, T. Wienold, D. Pelte, J. Biegansky, M. A. Vasiliev, Anton Andronic, D. Schüll, I. Legrand, J. Kecskemeti, Nicole Bastid, P. Fintz, Fouad Rami, N. Herrmann, C. Pinkenburg, M. Korolija, Byung-Sik Hong, Alexandre Lebedev, B. Sikora, W. Neubert, M. Trzaska, N. Cindro, Pascal Dupieux, H. Merlitz, S. Mohren, J. Erö, K. D. Hildenbrand, K. Siwek-Wilczyńska, Z. Basrak, and M. Dzelalija
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Equation of state, Nuclear Theory, Kinetic energy, Spectral line, Momentum, Nuclear physics, Pion, Nuclear fusion, Hermetic detector, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract: Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities ngp increase with the number of participants Apart. The average pion multiplicities per participant are #### and #### These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio #### increases with Apart and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (T l,π) and high (Th,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg is larger than , the high temperatures , are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed.
Published: 1997

18. Shape of collective flow in highly central Au(150 A MeV)+Au collisions

Author: J. Biegansky, Peter Wagner, F. Jundt, D. Schüll, I. Legrand, A. Sadchikov, M. A. Vasiliev, V. Simion, P. Fintz, D. Best, A. Zhilin, G.S. Wang, C. Roy, S. C. Jeong, Fouad Rami, P. Crochet, S. Hölbling, Z. Seres, K. D. Hildenbrand, Z. G. Fan, Byung-Sik Hong, R. Kotte, G. Mgebrishvili, V. T. Smolyankin, P. Pras, D. Pelte, Mihai Petrovici, U. Sodan, Christian Claude Kuhn, C. Maazouzi, N. Herrmann, W. Neubert, C. Pinkenburg, Y. Leifels, J. P. Coffin, B. Sikora, James Ritman, H. Stöcker, Z. Basrak, J. Kecskemeti, M. Dzelalija, P. Koncz, Y. Korchagin, D. Wohlfarth, T. Wienold, Pascal Dupieux, Z. Fodor, A. Lebedev, Nicole Bastid, L. Fraysse, M. Trzaska, N. Cindro, L. Tizniti, J. P. Wessels, R. Čaplar, R. Donà, Vladislav Manko, V. Amouroux, J. P. Alard, I. Belyaev, M. Kirejczyk, D. Moisa, J. Mösner, A. Buta, G. Guillaume, J. Konopka, A. Gobbi, W. Reisdorf, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and FOPI
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Flow (psychology), Degrees of freedom (physics and chemistry), Nuclear Reactions. Heavy ion collisions. Nuclear matter flow. Clusters, pacs:25.70.-z, 01 natural sciences, Charged particle, Nuclear physics, Cross section (physics), Transverse plane, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear fusion, Selection method, Polar coordinate system, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: Using the FOPI facility at GSI, charged particles (1 ≤Z≤6) produced in the Au(150 A MeV)+Au reaction have been measured at laboratory angles 1.20 < Θlab < 300. Highly central collisions have been selected with two criteria, both dealing with the longitudinal and transverse degrees of freedom of the reaction. The relevance of this selection method is supported by QMD calculations which indicate that such criteria are able to select mean impact parameters less than 2 fm. Bias effects introduced by the criteria have been evaluated. The centre-of-mass polar angle distributions of low energy clusters emitted in these central collisions, have been extracted: the intensity ratio deduced for a transverse to longitudinal emission is found to be R= 1.4 −0.4 +0.2 . Model comparisons using QMD are presented. The value of R appears to depend sensitively on the nucleon-nucleon cross section, σnn. Within this model, a value of σ=25+ - 5 mb is derived.
Published: 1997

19. Central collisions of Au on Au at 150, 250 and 400 A·MeV

Author: W. Reisdorf, D. Best, A. Gobbi, N. Herrmann, K.D. Hildenbrand, B. Hong, S.C. Jeong, Y. Leifels, C. Pinkenburg, J.L. Ritman, D. Schüll, U. Sodan, K. Teh, G.S. Wang, J.P. Wessels, T. Wienold, J.P. Alard, V. Amouroux, Z. Basrak, N. Bastid, I. Belyaev, L. Berger, J. Biegansky, M. Bini, S. Boussange, A. Buta, R. Čaplar, N. Cindro, J.P. Coffin, P. Crochet, R. Dona, P. Dupieux, M. Dželalija, J. Erö, M. Eskef, P. Fintz, Z. Fodor, L. Fraysse, A. Genoux-Lubain, G. Goebels, G. Guillaume, Y. Grigorian, E. Häfele, S. Hölbling, A. Houari, M. Ibnouzahir, M. Joriot, F. Jundt, J. Kecskemeti, M. Kirejczyk, P. Koncz, Y. Korchagin, M. Korolija, R. Kotte, C. Kuhn, D. Lambrecht, A. Lebedev, I. Legrand, C. Maazouzi, V. Manko, T. Matulewicz, P.R. Maurenzig, H. Merlitz, G. Mgebrishvili, J. Mösner, S. Mohren, D. Moisa, G. Montarou, I. Montbel, P. Morel, W. Neubert, A. Olmi, G. Pasquali, D. Pelte, M. Petrovici, G. Poggi, P. Pras, F. Rami, V. Ramillien, C. Roy, A. Sadchikov, Z. Seres, B. Sikora, V. Simion, K. Siwek-Wilczyńska, V. Smolyankin, N. Taccetti, R. Tezkratt, L. Tizniti, M. Trzaska, M.A. Vasiliev, P. Wagner, K. Wisniewski, D. Wohlfarth, and A. Zhilin
Subjects: Physics, selected central collisions, Nuclear and High Energy Physics, Angular range, E=150 and 250 and 400 MeV/nucleon, Isotope, charges and yields, comparison to statistical multifragmentation models, FOS: Physical sciences, deduced radial flow, measured fragment velocity vectors, Effective nuclear charge, Charged particle, Azimuth, Nuclear physics, Transverse plane, Cross section (physics), NUCLEAR REACTIONS Au(Au,X), chemical composition, Nuclear Experiment (nucl-ex), Nuclear Experiment, Quantum, quantum molecular dynamics model
Abstract: Collisions of Au on Au at incident energies of 150, 250 and 400 A MeV were studied with the FOPI-facility at GSI Darmstadt. Nuclear charge (Z < 16) and velocity of the products were detected with full azimuthal acceptance at laboratory angles of 1-30 degrees. Isotope separated light charged particles were measured with movable multiple telescopes in an angular range of 6-90 degrees. Central collisions representing about 1 % of the reaction cross section were selected by requiring high total transverse energy, but vanishing sideflow. The velocity space distributions and yields of the emitted fragments are reported. The data are analysed in terms of a thermal model including radial flow. A comparison with predictions of the Quantum Molecular Model is presented., LateX text 62 pages, plus six Postscript files with a total of 34 figures, accepted by Nucl.Phys.A
Published: 1997

20. Strangeness production in $\sqrt{s_{NN}} = 200$ GeV Au+Au collisions at RHIC

Author: B. Budick, Alexandru Jipa, Gunnar Løvhøiden, Y. K. Lee, E. Enger, Tomasz Kozik, C. Chasman, Ian Gardner Bearden, Bjørn Hallvard Samset, Jongmin Lee, B. McBreen, Dieter Røhrich, Stephen Sanders, Peter Christiansen, Ole Hansen, C. E. Jørgensen, Christian Holm Christensen, Z. Yin, C. Ristea, K. Hagel, R. R. Debbe, Borge Svane Nielsen, I. Arsene, R. Płaneta, M. Germinario, Calin Besliu, R. A. Scheetz, J. I. Jørdre, J. Cibor, M. Mikelsen, F. Jundt, I. S. Zgura, Trine Spedstad Tveter, B. Neumann, Anders Holm, E. J. Kim, R. Karabowicz, Fouad Rami, D. Sandberg, Oana Ristea, P. Staszel, D. R. Beavis, R. Wada, A. Makeev, T. M. Larsen, J. Norris, H. Bøggild, D. Ouerdane, J. B. Natowitz, H. Ito, Svein Lindal, R. Lystad, Z. Majka, Michael D. Murray, F. Videbæk, J. J. Gaardhøje, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and BRAHMS
Subjects: Physics, Physics and Astronomy (miscellaneous), Nuclear Theory, Strangeness production, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Resonance (particle physics), Spectral line, Nuclear physics, Pion, 25.75.Dw Particle and resonance production, High Energy Physics::Experiment, Production (computer science), Rapidity, Nuclear Experiment, Engineering (miscellaneous)
Abstract: The BRAHMS collaboration has measured identified particle spectra from Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV. Rapidity densities are deduced from fits to the pion and kaon spectra. dN/dy is plotted as a function of rapidity and 4π yields and ratios are calculated. The signed K/π ratios are compared to values obtained at lower energies. We find that K–/π– increases monotonically from the AGS and SPS regimes, while K+/π+ is similar to what was found at the highest $\sqrt{s_{NN}}$ at SPS. PACS: 25.75.Dw Particle and resonance production
Published: 2004

21. Evidence for collective expansion in light-particle emission following Au+Au collisions at 100, 150 and 250 A·MeV

Author: Z. Basrak, P. Morel, R. Tezkratt, A. Sadchikov, Nello Taccetti, K. D. Hildenbrand, J. P. Alard, R. Dona, Mihai Petrovici, R. Freifelder, Y. Korchagin, A. Houari, J. P. Wessels, G. Mgebrishvili, I. Legrand, V. Ramillien, Gabriele Pasquali, M. Krämer, Nicole Bastid, M. Dželalija, G. Guillaume, A. Buta, Pascal Dupieux, F. Jundt, P. Koncz, J. Erö, P. Wagner, Z. Seres, P. R. Maurenzig, D. Wohlfarth, J. Mösner, P. Fintz, J. P. Coffin, Y. Grigorian, Th. Blaich, Vladislav Manko, R. Kotte, D. Pelte, Christian Claude Kuhn, Gerard Montarou, T. Wienold, S. Hölbling, V. Simion, S. Frolov, D. Moisa, U. Sodan, Z.G. Fan, D. Schüll, M. A. Vasiliev, I. M. Belayev, A. Zhilin, F. Rami, V. Amouroux, J. Kecskemeti, S. Smolyankin, N. Herrmann, Alexandre Lebedev, B. Sikora, W. Neubert, W. Reisdorf, Alessandro Olmi, Z. Wilhelmi, R. Čaplar, A. Gobbi, M. Ibnouzahir, S. Boussange, C. Maguire, L. Berger, C. Cerruti, Zoltan Fodor, S. C. Jeong, Giacomo Poggi, Maurizio Bini, Pawel Danielewicz, I. Montbel, L. Fraysse, M. Trzaska, and N. Cindro
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Range (particle radiation), Isotope, Hydrogen, Phase (waves), chemistry.chemical_element, Kinetic energy, Spectral line, Coincidence, Nuclear physics, chemistry, Atomic physics, Nuclear Experiment
Abstract: Light-particle emission from Au+Au collisions has been studied in the bombarding-energy range 100–250 A ·MeV, using ΔE − E R telescopes in coincidence with the FOPI detector in its phase I configuration. Center-of-mass energy spectra have been measured for Z = 1,2 isotopes emitted in central collisions at CM polar angles between 60° and 90°. Evidence for a collective expansion is reported, on the basis of the mean kinetic energies of hydrogen isotopes. Comparison is presented with statistical calculations (WIX code). For CM kinetic energy spectra, fair agreement is found between data and a recently developed transport model.
Published: 1995

22. Central Au on Au collisions

Author: J. Erö, L. Berger, S. Mohren, J. Biegansky, D. Wohlfarth, Z. Basrak, James Ritman, D. Moisa, F. Jundt, W. Reisdorf, M. Dzelalija, Giacomo Poggi, Y. Korchagin, A. Zhilin, Fouad Rami, K.D. Hildenbrand, P. R. Maurenzig, I. Montbel, E. Häfele, Z. Fodor, V. Simion, R. Bock, D. Best, A. Gobbi, Gabriele Pasquali, Christian Claude Kuhn, M. Krämer, Adriano Gobbi, Mihai Petrovici, N. Herrmann, C. Cerruti, R. Kotte, U. Sodan, G. Goebels, S. Hölbling, W.Q. Shen, D. Pelte, M. A. Vasiliev, S. Boussange, V. Ramillien, C. Pinkenburg, J. P. Coffin, R. Dona, K. Siwek-Wilczyńska, J. Kecskemeti, P. Wagner, V. Amouroux, G. Mgebrishvili, Ch. Roy, B. Sikora, J. Mösner, A. Buta, M. Trzaska, D. Schüll, I. Legrand, Y. Leifels, G. Guillaume, Maurizio Bini, S. Smolyankin, I. M. Belayev, Nello Taccetti, G.S. Wang, P. Fintz, Alessandro Olmi, R. Čaplar, Y. Yatsounenko, A.L. Lebedev, Vladislav Manko, T. Wienold, J. P. Alard, Pascal Dupieux, L. Fraysse, M. Kowalczyk, N. Cindro, A. Houari, Nicole Bastid, W. Neubert, and M. Kirejczyk
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics
Published: 1995

23. Results from the BRAHMS experiment at RHIC

Author: J. I. Jørdre, Bjørn Hallvard Samset, J. Norris, M. Mikkelsen, R. A. Sheetz, Y. Blyakhman, Stephen Sanders, K. Grotowski, Ole Hansen, A. K. Holme, D. Sandberg, K. Hagel, C. E. Jørgensen, T. M. Larsen, I. S. Zgura, K. Olchanski, F. Videbæk, P. Staszel, B. McBreen, J. J. Gaardhøje, R. Karabowicz, Fouad Rami, Trine Spedstad Tveter, Dieter Røhrich, R. Planeta, R. R. Debbe, Alexandru Jipa, Dieter Roehrich, J. B. Natowitz, Ian Gardner Bearden, T. Keutgen, Tomasz Kozik, C. Chasman, A. Makeev, Gunnar Løvhøiden, H. Ito, E. Enger, Michael D. Murray, Y. K. Lee, F. Jundt, B. Budick, M. Germinario, J. Cibor, Christian Holm Christensen, E. J. Kim, H. Bøggild, D. Ouerdane, J. Brzychczyk, Peter Christiansen, Borge Svane Nielsen, Calin Besliu, Z. Majka, R. Wada, Z. Yin, A. Wieloch, D. R. Beavis, E. Jakobsen, Jongmin Lee, and Zbigniew Sosin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Nuclear Theory, Hadron, Elementary particle, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, Baryon, Pion, Pseudorapidity, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract: Results from the BRAHMS collaboration for Au+Au collisions at √ S NN = 200 GeV are presented, focussing on the measurement of the net-proton rapidity distribution, the determination of the pseudorapidity distribution of charged particles and on the rapidity distributions of pions and kaons.
Published: 2003

24. Time projection chambers for ultra-relativistic heavy-ion experiments with a mid-rapidity spectrometer

Author: F. Videbæk, P. Fintz, C. Maazouzi, J.P. Coffin, F. Jundt, C. Kuhn, Fouad Rami, G. Guillaume, P. Wagner, and I. Brancus
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Time projection chamber, Spectrometer, Physics::Instrumentation and Detectors, Hadron, Tracking (particle physics), Spectral line, Nuclear physics, Momentum, Pseudorapidity, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract: The design of Time Projection Chamber (TPC) detectors as tracking devices for the mid-rapidity spectrometer of the Broad Range Hadron Magnetic Spectrometers (BRAHMS) for use at the RHIC facility is presented. BRAHMS will provide the capabilities of measuring inclusive and semi-inclusive momentum spectra of π ± , K ± p ± in the pseudorapidity range of 0 η t up to 1.5 GeV c at all pseudorapidities and to at least 2.5 GeV/c for η
Published: 1994

25. Velocity correlations of intermediate mass fragments produced in central collisions of Au+Au atE=150AMeV

Author: O. Houari, Z. Wilhelmi, A.L. Lebedev, C. Maguire, I. M. Belayev, M. Krämer, P. Koncz, D. Moisa, J. Mösner, D. Wohlfarth, G. Montaru, A. Sadchikov, M. A. Vasiliev, V. Simion, Vladislav Manko, R. Freifelder, A. Buta, D. Schüll, J. P. Wessels, Z. Basrak, F. Jundt, I. Legrand, Fouad Rami, S. Frolov, G. Guillaume, W. Reisdorf, R. Kotte, J. P. Alard, K. Teh, D. Pelte, P. Wagner, B. Sikora, Mihai Petrovici, N. Herrmann, S. C. Jeong, Y. Korchagin, U. Sodan, A. L. Zhilin, Z. G. Fan, K. D. Hildenbrand, J. Kecskemeti, R. Čaplar, S. Smolyankin, I. Montbel, G. Mgebrishvili, R. Tezkratt, A. Gobbi, L. Fraysse, M. Trzaska, Nicole Bastid, M. Jorio, Z. Seres, Th. Blaich, S. Hölbling, N. Cindro, J. Erö, J. P. Coffin, T. Matulewicz, C. Cerruti, W. Neubert, Christian Claude Kuhn, Zoltan Fodor, P. Morel, Pascal Dupieux, Y. Grigorian, T. Wienold, P. Fintz, and B. Kämpfer
Subjects: Nuclear physics, Nuclear reaction, Physics, Azimuth, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), Detector, Coulomb, Interaction model, Atomic physics, Nuclear Experiment, Beam energy
Abstract: Velocity correlations of intermediate mass fragments (IMFs), produced in central collisions of Au+Au at 150 MeV beam energy, are extracted from measurements with the FOPI (phase I) detector system at SIS in GSI Darmstadt. The IMF correlation function for semicentral events is found to be affected by the directed sideward flow. When rotating the events into a unique reaction plane an enhancement of correlations, resulting from event mixing effects, vanishes. Selecting violent collisions with a high degree of azimuthal symmetry the correlation function appears nearly independent of additional event or single particle gate conditions. The comparison of the data with a Coulomb dominated final-state interaction model points to an expanding and multifragmenting soure with radius [ital R][similar to]14 fm.
Published: 1993

26. Entropy production in the Au+Au reaction between 150Aand 800AMeV

Author: J. Mösner, A. Buta, R. Kotte, D. Pelte, G. Guillaume, L. Fraysse, Gerard Montarou, Y. Korchagin, I. Montbel, M. Jorio, B. Sikora, Z. Seres, F. Jundt, S. Boussange, C. Cerruti, D. Schüll, I. Legrand, R. Freifelder, J. Konopka, Z. Basrak, P. Koncz, T. Wienold, K. Teh, Fouad Rami, A. Gobbi, S. Frolov, D. Wohlfarth, S. Smolyankin, S. Ramillien, Z. Wilhelmi, J. P. Coffin, Christian Claude Kuhn, J. Kecskemeti, Mihai Petrovici, J. P. Wessels, C. Maguire, U. Sodan, Y. Grigorian, I. M. Belayev, M. Krämer, Pascal Dupieux, Peter Wagner, W. Reisdorf, A. Sadchikov, Z. Fodor, Z. G. Fan, P. Fintz, D. Moisa, M. Trzaska, V. Simion, N. Cindro, N. Herrmann, K. D. Hildenbrand, T. Matulewicz, Th. Blaich, S. Hölbling, J. Erö, L. Berger, A. Houari, Alexandre Lebedev, W. Neubert, Vladislav Manko, A. Zhilin, J. P. Alard, R. Čaplar, Nicole Bastid, R. Tezkratt, M. A. Vasiliev, S. C. Jeong, R. Dona, and G. Mgebrishvili
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Entropy (classical thermodynamics), Entropy production, Atomic physics
Published: 1993

27. A highly-segmented ΔE-time-of-flight wall as forward detector of the 4π-system for charged particles at the SIS/ESR accelerator

Author: M. A. Vasiliev, V. Simion, M. Crouau, G. Augustinski, J.P. Coffin, D. Vincent, F. Hornecker, S. Frolov, M. Marquardt, R. Freifelder, Z. Basrak, C. Cerruti, R. Kotte, N. Herrmann, L. Fraysse, B. Sikora, S. C. Jeong, Gerard Montarou, Z. G. Fan, Y. Grigorian, P. Koncz, S. Smolyankin, P. Morel, W. Reisdorf, R. Bock, D. Wohlfarth, R. Čaplar, N. Cindro, G. Mgebrishvili, J. Erö, A. Gobbi, R. Neunlist, G. Ortlepp, J.P. Wessels, P. Boccaccio, E. Sahuc, J.P. Alard, C. Kuhn, M. Jorio, J. Mösner, E. Gimenez, Vladislav Manko, C. Maguire, T. Matulewicz, S. Boussange, A. Buta, Y. Korchagin, I. Montbel, N. Bastid, D. Schüll, I. Legrand, Th. Blaich, Z. Fodor, I. M. Belayev, M. Krämer, G. Guillaume, S. Hölbling, R. J. Charity, Z. Seres, M.A. Saettel, D. Moisa, P. Fintz, F. Rami, P. Dupieux, B. Tischler, T. Wienold, J. Kecskemeti, J. Weinert, A. Houari, R. Tezkratt, M. Trzaska, W. Neubert, D. Pelte, A.L. Lebedev, P. Wagner, Mihai Petrovici, U. Sodan, J.F. Devin, K.D. Hildenbrand, M.H. Tanaka, F. Jundt, A. Zhilin, K. Teh, F. Daudon, C. Fayard, S. Mayade, Z. Wilhelmi, and G. Savinel
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Wire chamber, Physics::Instrumentation and Detectors, Nuclear Theory, Detector, Scintillator, Particle detector, Charged particle, Nuclear physics, Time of flight, Ionization chamber, Atomic physics, Nuclear Experiment, Instrumentation
Abstract: At the SIS/ESR accelerator facility at GSI in Darmstadt the 4π-detector system FOPI is under construction at present. It is designed for the investigation of central collisions of heavy ions in the energy range up to 2 A GeV. As phase I of this detector a forward wall has been built and used in various experiments. It comprizes a total number of 764 scintillators with an additional shell of 188 thin ΔE -detectors in front of it and covers the full azimuth of the polar angles from 1° to 30°. The velocity and the nuclear charge of the fragments are determined by a combined time-of-flight and ΔE measurement.
Published: 1993

28. Notch and NF-κB signaling pathways in the biology of classical Hodgkin lymphoma

Author: R, Schwarzer and F, Jundt
Subjects: Gene Expression Regulation, Neoplastic, Lymphoma, B-Cell, Receptors, Notch, Antigens, CD, Intracellular Signaling Peptides and Proteins, NF-kappa B, Animals, Humans, Reed-Sternberg Cells, Hodgkin Disease, Signal Transduction
Abstract: Classical Hodgkin lymphoma (cHL) is now recognized as a B-cell-derived lymphoma which is characterized by only about 1% malignant pathognomonic Hodgkin and Reed-Sternberg (HRS) cells and an abundant infiltrate of reactive bystander cells. HRS cells are unique with respect to their lost B-cell-specific gene expression pattern and recurrent genetic lesions. Aberrant activity of Notch signaling, a highly conserved developmental pathway, acts as a negative regulator of the B cell program in HRS cells and thereby contributes to their reprogramming. Another striking feature and the major pathogenetic mechanism in HRS cells is constitutive NF-κB activation. A number of aberrations that contribute to canonical NF-κB activity in HRS cells have been described such as genetic lesions, deregulated receptor signaling and Epstein-Barr virus (EBV) infection. The importance of Notch and NF-κB signaling for cHL pathogenesis, their potential cross-talk and implications for future therapeutic applications are being discussed.
Published: 2010

29. Midrapidity source of intermediate-mass fragments in highly central collisions of Au + Au at 150AMeV

Author: Alessandro Olmi, Y. Grigorian, Th. Blaich, P. Koncz, Z. Seres, T. Matulewicz, S. Hölbling, J. Kecskemeti, R. Tezkratt, D. Schüll, I. Legrand, M. Crouau, P. Fintz, R. Freifelder, J. P. Alard, M. A. Vasiliev, V. Simion, P. Morel, Z. Basrak, Fouad Rami, A. Sadchikov, F. Jundt, R. Kotte, Zoltan Fodor, Nello Taccetti, D. Pelte, C. Cerruti, R. Čaplar, Gerard Montarou, J. Erö, D. Moisa, A. Zhilin, Z. Wilhelmi, J. Mösner, K.D. Hildenbrand, K. Teh, T. Wienold, S. Smolyankin, A. Buta, Mihai Petrovici, U. Sodan, P. Wagner, G. Guillaume, S. C. Jeong, Gabriele Pasquali, W. Neubert, M. Jorio, Pascal Dupieux, G. Mgebrishvili, Y. Korchagin, Giacomo Poggi, J.P. Wessels, J. P. Coffin, W. Reisdorf, L. Fraysse, A. Gobbi, M. Trzaska, N. Cindro, Christian Claude Kuhn, C. Maguire, I. M. Belayev, M. Krämer, D. Wohlfarth, Z. G. Fan, Maurizio Bini, N. Herrmann, Vladislav Manko, B. Sikora, O. Houari, Nicole Bastid, A.L. Lebedev, S. Frolov, and R. Bock
Subjects: Physics, Nuclear physics, Nuclear reaction, Transverse plane, Isotope, General Physics and Astronomy, Incident energy, Isotopes of gold, Atomic physics, Nuclear Experiment, Selection criterion, Effective nuclear charge, Charged particle
Abstract: Charged particles have been observed in collisions of Au on Au at an incident energy of 150{ital A} MeV using a high-granularity detector system covering approximately the forward hemisphere in the center-of-mass system. Highly central collisions have been studied using a double selection criterion which combines large charged-particle multiplicities with small transverse-momentum directivities. In this class of events about one quarter of the total nuclear charge emerges as intermediate-mass fragments with nuclear charges {ital Z}{gt}2. These fragments are centered at midrapidity and are produced with large transverse velocities.
Published: 1992

30. In-plane particle-residue correlations in theAr40(1100 MeV)+24Mg reaction

Author: F. Jundt, J. P. Coffin, F. Rami, B. Rastegar, M. Bozin, P. Fintz, K. Krishan, G. Guillaume, A. Malki, M. Zahar, and P. Wagner
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Residue (complex analysis), In plane, Particle, Atomic physics
Published: 1992

31. The 40Ca + 16O fusion cross sections

Author: A. Gallmann, F. Jundt, P. Fintz, G. Guillaume, and I. Riedinger-Ordoñez
Subjects: Nuclear physics, Excitation function, Physics, Angular momentum, Fusion
Published: 2008

32. Centrality dependent particle production aty=0andy~1in Au+Au collisions atsNN=200 GeV

Author: Trine Spedstad Tveter, Stephen Sanders, B. Budick, K. Hagel, Bjørn Hallvard Samset, C. E. Jørgensen, Calin Besliu, C. Chasman, H. Ito, J. Cibor, Jongmin Lee, Ian Gardner Bearden, A. Makeev, D. R. Beavis, Gunnar Løvhøiden, Z. Majka, Y. K. Lee, P. Staszel, Tomasz Kozik, Borge Svane Nielsen, B. Neumann, Alexandru Jipa, R. R. Debbe, D. Sandberg, M. Germinario, Peter Christiansen, T. M. Larsen, R. Karabowicz, Fouad Rami, R. Wada, J. I. Jørdre, Christian Holm Christensen, E. J. Kim, F. Videbæk, Z. Yin, C. Ristea, R. A. Scheetz, I. Arsene, I. S. Zgura, Oana Ristea, R. Płaneta, M. Mikelsen, F. Jundt, J. J. Gaardhøje, E. Enger, Dieter Røhrich, H. Bøggild, D. Ouerdane, J. B. Natowitz, Michael D. Murray, Svein Lindal, and R. Lystad
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, 01 natural sciences, 7. Clean energy, Baryon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon, Centrality
Abstract: Particle production of identified charged hadrons, ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}},{K}^{\ifmmode\pm\else\textpm\fi{}},p$, and $\overline{p}$ in Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=$ 200 GeV, has been studied as a function of transverse momentum and collision centrality at $y=0$ and $y~1$ by the BRAHMS experiment at Brookhaven National Laboratory's Relativistic Heavy-Ion Collider. Significant collective transverse flow at kinetic freeze-out has been observed in the collisions. The magnitude of the flow rises with the collision centrality. Proton and kaon yields relative to the pion production increase strongly as the transverse momentum increases and also increase with centrality. Particle yields per participant nucleon show a weak dependence on the centrality for all particle species. Hadron production remains relatively constant within one unit around midrapidity in Au+Au collisions at $\sqrt{{s}_{\mathit{NN}}}=$ 200 GeV.
Published: 2005

33. Charged Meson Rapidity Distributions in CentralAu+AuCollisions atsNN=200 GeV

Author: F. Videbæk, J. J. Gaardhøje, Bjørn Hallvard Samset, P. Staszel, R. Karabowicz, Fouad Rami, I. S. Zgura, C. E. Jørgensen, Michael Murray, Anders Holm, J. Norris, Stephen Sanders, Ian Gardner Bearden, D. Sandberg, Dieter Røhrich, T. M. Larsen, M. Germinario, M. Mikelsen, F. Jundt, K. Hagel, R. A. Sheetz, C. Chasman, E. Enger, H. Bøggild, D. Ouerdane, J. B. Natowitz, Christian Holm Christensen, E. J. Kim, H. Ito, B. Budick, J. Cibor, J. I. Jørdre, R. Płaneta, A. Makeev, D. R. Beavis, A. K. Holme, R. R. Debbe, Alexandru Jipa, K. Olchanski, Gunnar Løvhøiden, R. Wada, Ole Hansen, Y. K. Lee, Tomasz Kozik, Peter Christiansen, Jongmin Lee, Trine Spedstad Tveter, Z. Yin, C. Ristea, Borge Svane Nielsen, Calin Besliu, and Z. Majka
Subjects: Nuclear physics, Physics, Range (particle radiation), Particle physics, Pion, Meson, General Physics and Astronomy, Rapidity, Central region, Longitudinal direction
Abstract: We have measured rapidity densities dN/dy of pi+/- and K+/- over a broad rapidity range (-0.1 < y < 3.5) for central Au + Au collisions at square root(sNN) = 200 GeV. These data have significant implications for the chemistry and dynamics of the dense system that is initially created in the collisions. The full phase-space yields are 1660 +/- 15 +/- 133 (pi+), 1683 +/- 16 +/- 135 (pi-), 286 +/- 5 +/- 23 (K+), and 242 +/- 4 +/- 19 (K-). The systematics of the strange to nonstrange meson ratios are found to track the variation of the baryochemical potential with rapidity and energy. Landau-Carruthers hydrodynamics is found to describe the bulk transport of the pions in the longitudinal direction.
Published: 2005

34. Centrality Dependence of Charged-Particle Pseudorapidity Distributions fromd+AuCollisions atsNN=200 GeV

Author: M. Mikelsen, F. Jundt, J. I. Jørdre, Stephen Sanders, Calin Besliu, R. R. Debbe, Christian Holm Christensen, Ian Gardner Bearden, K. Hagel, E. J. Kim, Y.K. Lee, Jongmin Lee, B. Budick, Trine Spedstad Tveter, R. Płaneta, Alexandru Jipa, R. Wada, C. Chasman, D. Sandberg, I. S. Zgura, Tomasz Kozik, Bjørn Hallvard Samset, M. Germinario, I. Arsene, Z. Yin, C. Ristea, Dieter Røhrich, C. E. Jørgensen, Z. Majka, Borge Svane Nielsen, B. Neumann, E. Enger, J. Cibor, A. Makeev, R. Karabowicz, Fouad Rami, Oana Ristea, Gunnar Løvhøiden, R. A. Sheetz, D. R. Beavis, P. Staszel, Peter Christiansen, T. M. Larsen, F. Videbæk, J. J. Gaardhøje, Michael D. Murray, H. Bøggild, D. Ouerdane, J. B. Natowitz, H. Ito, Svein Lindal, and R. Lystad
Subjects: Quantum chromodynamics, Nuclear reaction, Physics, Particle physics, General Physics and Astronomy, Perturbative QCD, Semiclassical physics, Charged particle, Nuclear physics, Pseudorapidity, High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, Centrality
Abstract: Charged-particle pseudorapidity densities are presented for the $d+\mathrm{A}\mathrm{u}$ reaction at $\sqrt{{s}_{NN}}=200\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ with $\ensuremath{-}4.2\ensuremath{\le}\ensuremath{\eta}\ensuremath{\le}4.2$. The results, from the BRAHMS experiment at BNL Relativistic Heavy-Ion Collider, are shown for minimum-bias events and 0%--30%, 30%--60%, and 60%--80% centrality classes. Models incorporating both soft physics and hard, perturbative QCD-based scattering physics agree well with the experimental results. The data do not support predictions based on strong-coupling, semiclassical QCD. In the deuteron-fragmentation region the central 200 GeV data show behavior similar to full-overlap $d+\mathrm{A}\mathrm{u}$ results at $\sqrt{{s}_{NN}}=19.4\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$.
Published: 2005

35. Evolution of the Nuclear Modification Factors with Rapidity and Centrality ind+AuCollisions atNNS=200 GeV

Author: A. Makeev, Stephen Sanders, F. Videbæk, Jongmin Lee, H. Bøggild, D. Ouerdane, K. Hagel, P. Staszel, J. B. Natowitz, Borge Svane Nielsen, M. Mikelsen, Svein Lindal, R. Karabowicz, R. Wada, F. Jundt, Calin Besliu, R. Lystad, I. Arsene, Trine Spedstad Tveter, J. J. Gaardhøje, H. Ito, Y. K. Lee, R. A. Scheetz, B. Neumann, Dieter Røhrich, Alexandru Jipa, Z. Majka, Tomasz Kozik, M. Germinario, Oana Ristea, Fouad Rami, I. S. Zgura, B. Budick, D. Sandberg, Gunnar Løvhøiden, D. R. Beavis, Christian Holm Christensen, Ian Gardner Bearden, E. J. Kim, T. M. Larsen, E. Enger, R. R. Debbe, Peter Christiansen, Michael D. Murray, R. Płaneta, J. I. Jørdre, Z. Yin, C. Ristea, C. Chasman, J. Cibor, Bjørn Hallvard Samset, and C. E. Jørgensen
Subjects: Physics, Particle physics, Computer Science::Information Retrieval, Nuclear Theory, Hadron, General Physics and Astronomy, Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing), Color-glass condensate, Gluon, Nuclear physics, Deuterium, Pseudorapidity, Saturation (graph theory), High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Centrality
Abstract: We report on a study of the transverse momentum dependence of nuclear modification factors ${R}_{d\mathrm{A}\mathrm{u}}$ for charged hadrons produced in $\mathrm{\text{deuteron}}\text{ }\text{ }+\text{ }\text{ }\mathrm{\text{gold}}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$, as a function of collision centrality and of the pseudorapidity ($\ensuremath{\eta}=0$, 1, 2.2, 3.2) of the produced hadrons. We find a significant and systematic decrease of ${R}_{d\mathrm{A}\mathrm{u}}$ with increasing rapidity. The midrapidity enhancement and the forward rapidity suppression are more pronounced in central collisions relative to peripheral collisions. These results are relevant to the study of the possible onset of gluon saturation at energies reached at BNL RHIC.
Published: 2004

36. Nuclear Stopping inAu+AuCollisions atsNN=200 GeV

Author: I. G. Bearden, D. Beavis, C. Besliu, B. Budick, H. Bøggild, C. Chasman, C. H. Christensen, P. Christiansen, J. Cibor, R. Debbe, E. Enger, J. J. Gaardhøje, M. Germinario, K. Hagel, O. Hansen, A. Holm, A. K. Holme, H. Ito, A. Jipa, F. Jundt, J. I. Jørdre, C. E. Jørgensen, R. Karabowicz, E. J. Kim, T. Kozik, T. M. Larsen, J. H. Lee, Y. K. Lee, G. Løvhøiden, Z. Majka, A. Makeev, M. Mikelsen, M. Murray, J. Natowitz, B. S. Nielsen, J. Norris, K. Olchanski, D. Ouerdane, R. Płaneta, F. Rami, C. Ristea, D. Röhrich, B. H. Samset, D. Sandberg, S. J. Sanders, R. A. Scheetz, P. Staszel, T. S. Tveter, F. Videbæk, R. Wada, Z. Yin, and I. S. Zgura
Subjects: Nuclear physics, Physics, Range (particle radiation), Proton, Antiproton, Yield (chemistry), Transverse momentum, General Physics and Astronomy, Rapidity, Atomic physics, Nuclear Experiment, Nucleon, Spectral line
Abstract: Transverse momentum spectra and rapidity densities, dN/dy, of protons, antiprotons, and net protons (p-p) from central (0%-5%) Au+Au collisions at square root of S(NN)=200 GeV were measured with the BRAHMS experiment within the rapidity range 0
Published: 2004

37. Charged meson rapidity distributions in central Au+Au collisions at square root(sNN) = 200 GeV

Author: I G, Bearden, D, Beavis, C, Besliu, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, E, Enger, J J, Gaardhøje, M, Germinario, K, Hagel, O, Hansen, A, Holm, A K, Holme, H, Ito, A, Jipa, F, Jundt, J I, Jørdre, C E, Jørgensen, R, Karabowicz, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, G, Løvhøiden, Z, Majka, A, Makeev, M, Mikelsen, M, Murray, J, Natowitz, B S, Nielsen, J, Norris, K, Olchanski, D, Ouerdane, R, Płaneta, F, Rami, C, Ristea, D, Röhrich, B H, Samset, D, Sandberg, S J, Sanders, R A, Sheetz, P, Staszel, T S, Tveter, F, Videaek, R, Wada, Z, Yin, and I S, Zgura
Abstract: We have measured rapidity densities dN/dy of pi+/- and K+/- over a broad rapidity range (-0.1y3.5) for central Au + Au collisions at square root(sNN) = 200 GeV. These data have significant implications for the chemistry and dynamics of the dense system that is initially created in the collisions. The full phase-space yields are 1660 +/- 15 +/- 133 (pi+), 1683 +/- 16 +/- 135 (pi-), 286 +/- 5 +/- 23 (K+), and 242 +/- 4 +/- 19 (K-). The systematics of the strange to nonstrange meson ratios are found to track the variation of the baryochemical potential with rapidity and energy. Landau-Carruthers hydrodynamics is found to describe the bulk transport of the pions in the longitudinal direction.
Published: 2004

38. Evolution of the nuclear modification factors with rapidity and centrality in d + Au collisions at (sqrt)[N(S)N]=200 GeV

Author: I, Arsene, I G, Bearden, D, Beavis, C, Besliu, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, E, Enger, J J, Gaardhøje, M, Germinario, K, Hagel, H, Ito, A, Jipa, F, Jundt, J I, Jørdre, C E, Jørgensen, R, Karabowicz, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, S, Lindal, R, Lystad, G, Løvhøiden, Z, Majka, A, Makeev, M, Mikelsen, M, Murray, J, Natowitz, B, Neumann, B S, Nielsen, D, Ouerdane, R, Płaneta, F, Rami, C, Ristea, O, Ristea, D, Röhrich, B H, Samset, D, Sandberg, S J, Sanders, R A, Scheetz, P, Staszel, T S, Tveter, F, Videbaek, R, Wada, Z, Yin, and I S, Zgura
Abstract: We report on a study of the transverse momentum dependence of nuclear modification factors R(dAu) for charged hadrons produced in deuteron + gold collisions at sqrt[s(NN)]=200 GeV, as a function of collision centrality and of the pseudorapidity (eta=0, 1, 2.2, 3.2) of the produced hadrons. We find a significant and systematic decrease of R(dAu) with increasing rapidity. The midrapidity enhancement and the forward rapidity suppression are more pronounced in central collisions relative to peripheral collisions. These results are relevant to the study of the possible onset of gluon saturation at energies reached at BNL RHIC.
Published: 2004

39. The New Physics at RHIC. From Transparency to High p$_t$ Suppression

Author: Ian Gardner Bearden, B. McBreen, Tomasz Kozik, Stephen Sanders, M. Germinario, Trine Spedstad Tveter, Ole Hansen, M. Mikelsen, Bjørn Hallvard Samset, I. S. Zgura, Calin Besliu, Y.K. Lee, F. Jundt, K. Hagel, R. A. Scheetz, P. Staszel, Anders Holm, C. E. Jørgensen, B. Budick, J. J. Gaardhøje, J. I. Jørdre, Christian Holm Christensen, Z. Majka, H. Bøggild, D. Ouerdane, J. B. Natowitz, H. Ito, Oana Ristea, Michael D. Murray, Z. Yin, R. Płaneta, Svein Lindal, T. M. Larsen, C. Ristea, R. Lystad, Borge Svane Nielsen, D. Sandberg, R. R. Debbe, C. Chasman, J. Norris, Alexandru Jipa, D. R. Beavis, R. Wada, J. Cibor, Jongmin Lee, E. Enger, R. Karabowicz, A. Makeev, D. Ro¨hrich, E. J. Kim, Fouad Rami, Gunnar Løvhøiden, Peter Christiansen, I. Arsene, and B. Neumann
Subjects: Thermal equilibrium, Nuclear reaction, Physics, Nuclear and High Energy Physics, Hadron, FOS: Physical sciences, Parton, Charged particle, Nuclear physics, Color model, Strange matter, Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment
Abstract: Heavy ion collisions at RHIC energies (Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV) exhibit significant new features as compared to earlier experiments at lower energies. The reaction is characterized by a high degree of transparency of the collisions partners leading to the formation of a baryon-poor central region. In this zone, particle production occurs mainly from the stretching of the color field. The initial energy density is well above the one considered necessary for the formation of the Quark Gluon Plasma, QGP. The production of charged particles of various masses is consistent with chemical and thermal equilibrium. Recently, a suppression of the high transverse momentum component of hadron spectra has been observed in central Au+Au collisions. This can be explained by the energy loss experienced by leading partons in a medium with a high density of unscreened color charges. In contrast, such high $p_t$ jets are not suppressed in d+Au collisions suggesting that the high $p_t$ suppression is not due to initial state effects in the ultrarelativistic colliding nuclei., 15 pages, 11 figures. to appear in Nucl. Physics A. Invited talk at 'Nucleus-Nucleus Collisions 2003' conference, Moscow
Published: 2004

40. Centrality dependence of charged-particle pseudorapidity distributions from d + Au collisions at sqrt[sNN] = 200 GeV

Author: I, Arsene, I G, Bearden, D, Beavis, C, Besliu, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, E, Enger, J J, Gaardhøje, M, Germinario, K, Hagel, H, Ito, A, Jipa, J I, Jørdre, F, Jundt, C E, Jørgensen, R, Karabowicz, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, S, Lindal, R, Lystad, G, Løvhøiden, Z, Majka, A, Makeev, M, Mikelsen, M, Murray, J, Natowitz, B, Neumann, B S, Nielsen, D, Ouerdane, R, Płaneta, F, Rami, C, Ristea, O, Ristea, D, Röhrich, B H, Samset, D, Sandberg, S J, Sanders, R A, Sheetz, P, Staszel, T S, Tveter, F, Videbaek, R, Wada, Z, Yin, and I S, Zgura
Abstract: Charged-particle pseudorapidity densities are presented for the d + Au reaction at sqrt[s(NN)] = 200 GeV with -4.2or = etaor = 4.2. The results, from the BRAHMS experiment at BNL Relativistic Heavy-Ion Collider, are shown for minimum-bias events and 0%-30%, 30%-60%, and 60%-80% centrality classes. Models incorporating both soft physics and hard, perturbative QCD-based scattering physics agree well with the experimental results. The data do not support predictions based on strong-coupling, semiclassical QCD. In the deuteron-fragmentation region the central 200 GeV data show behavior similar to full-overlap d+Au results at sqrt[s(NN)] = 19.4 GeV.
Published: 2004

41. Nuclear stopping in Au+Au collisions at square root of S(NN)=200 GeV

Author: I G, Bearden, D, Beavis, C, Besliu, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, E, Enger, J J, Gaardhøje, M, Germinario, K, Hagel, O, Hansen, A, Holm, A K, Holme, H, Ito, A, Jipa, F, Jundt, J I, Jørdre, C E, Jørgensen, R, Karabowicz, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, G, Løvhøiden, Z, Majka, A, Makeev, M, Mikelsen, M, Murray, J, Natowitz, B S, Nielsen, J, Norris, K, Olchanski, D, Ouerdane, R, Płaneta, F, Rami, C, Ristea, D, Röhrich, B H, Samset, D, Sandberg, S J, Sanders, R A, Scheetz, P, Staszel, T S, Tveter, F, Videbaek, R, Wada, Z, Yin, and I S, Zgura
Abstract: Transverse momentum spectra and rapidity densities, dN/dy, of protons, antiprotons, and net protons (p-p) from central (0%-5%) Au+Au collisions at square root of S(NN)=200 GeV were measured with the BRAHMS experiment within the rapidity range 0/=y/=3. The proton and antiproton dN/dy decrease from midrapidity to y=3. The net-proton yield is roughly constant for y1 at dN/dy approximately 7, and increases to dN/dy approximately 12 at y approximately 3. The data show that collisions at this energy exhibit a high degree of transparency and that the linear scaling of rapidity loss with rapidity observed at lower energies is broken. The energy loss per participant nucleon is estimated to be 73+/-6 GeV.
Published: 2003

42. Transverse-Momentum Spectra inAu+Auandd+AuCollisions atsNN=200 GeVand the Pseudorapidity Dependence of High-pTSuppression

Author: F. Videbæk, G. Lystad, J. J. Gaardhøje, E. Enger, I. S. Zgura, Jongmin Lee, Anders Holm, M. Mikelsen, F. Jundt, Michael D. Murray, Z. Majka, B. McBreen, A. Makeev, T. M. Larsen, Dieter Røhrich, Ian Gardner Bearden, J. Cibor, J. I. Jørdre, Borge Svane Nielsen, B. Budick, B. Neumann, Trine Spedstad Tveter, Stephen Sanders, D. R. Beavis, Y. K. Lee, K. Hagel, C. Chasman, Bjørn Hallvard Samset, C. E. Jørgensen, Z. Yin, C. Ristea, Calin Besliu, R. Karabowicz, P. Staszel, H. Bøggild, R. R. Debbe, D. Ouerdane, I. Arsene, E. J. Kim, J. B. Natowitz, Alexandru Jipa, H. Ito, Svein Lindal, M. Germinario, D. Sandberg, J. Norris, R. A. Scheetz, Oana Ristea, R. Wada, Ole Hansen, Christian Holm Christensen, Gunnar Løvhøiden, R. Płaneta, Peter Christiansen, Fouad Rami, and Tomasz Kozik
Subjects: Physics, Energy loss, Particle physics, Pseudorapidity, Transverse momentum, Hadron, General Physics and Astronomy, Modification factor, Atomic physics, Nuclear Experiment, Spectral line, Energy (signal processing)
Abstract: We present spectra of charged hadrons from $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ and $d+\mathrm{A}\mathrm{u}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ measured with the BRAHMS experiment at RHIC. The spectra for different collision centralities are compared to spectra from $p+\overline{p}$ collisions at the same energy scaled by the number of binary collisions. The resulting ratios (nuclear modification factors) for central $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at $\ensuremath{\eta}=0$ and $\ensuremath{\eta}=2.2$ evidence a strong suppression in the high ${p}_{T}$ region ($g2\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/c$). In contrast, the $d+\mathrm{A}\mathrm{u}$ nuclear modification factor (at $\ensuremath{\eta}=0$) exhibits an enhancement of the high ${p}_{T}$ yields. These measurements indicate a high energy loss of the high ${p}_{T}$ particles in the medium created in the central $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions. The lack of suppression in $d+\mathrm{A}\mathrm{u}$ collisions makes it unlikely that initial state effects can explain the suppression in the central $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions.
Published: 2003

43. High $p_T$ results for Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

Author: D. Sandberg, Jongmin Lee, M. Germinario, Z. Majka, Calin Besliu, Michael D. Murray, Ian Gardner Bearden, Borge Svane Nielsen, Christian Holm Christensen, F. Videbæk, R. A. Scheetz, Oana Ristea, Stephen Sanders, K. Hagel, Alexandru Jipa, Peter Christiansen, R. Płaneta, Trine Spedstad Tveter, Z. Yin, C. Ristea, R. Karabowicz, Fouad Rami, J. J. Gaardhøje, J. I. Jørdre, I. S. Zgura, J. Norris, I. Arsene, R. Wada, Anders Holm, E. J. Kim, Gunnar Løvhøiden, Y. K. Lee, P. Staszel, B. Neumann, A. Makeev, M. Mikelsen, F. Jundt, Tomasz Kozik, J. Cibor, Bjørn Hallvard Samset, Ole Hansen, C. E. Jørgensen, B. Budick, C. Chasman, R. R. Debbe, B. McBreen, Dieter Røhrich, E. Enger, H. Bøggild, D. Ouerdane, J. B. Natowitz, H. Ito, Svein Lindal, R. Lystad, T. M. Larsen, D. R. Beavis, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and BRAHMS
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Resonance (particle physics), Spectral line, Pion, Transverse momentum, Particle, 25.75.Dw Particle and resonance production, Rapidity, Nuclear Experiment, Engineering (miscellaneous)
Abstract: We present transverse momentum spectra of unidentified charged hadrons at two pseudo-rapidities (η = 0, 2.2) as well as the first results on identified negatively charged pions at rapidity 2.2 from Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV. The high p T yields of charged hadrons in the most central collisions show a strong suppression when compared to expected binary-scaled yields from nucleon-nucleon collisions or semi-peripheral collisions. The π– spectra at forward rapidity (y = 2.2) also indicate a clear suppression of high p T π– yields in central collisions. PACS: 25.75.Dw Particle and resonance production
Published: 2003

44. Transverse-momentum spectra in Au+Au and d+Au collisions at sqrt[s(NN)]=200 GeV and the pseudorapidity dependence of high-p(T) suppression

Author: I, Arsene, I G, Bearden, D, Beavis, C, Besliu, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, E, Enger, J J, Gaardhøje, M, Germinario, K, Hagel, O, Hansen, A, Holm, H, Ito, A, Jipa, F, Jundt, J I, Jørdre, C E, Jørgensen, R, Karabowicz, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, S, Lindal, G, Lystad, G, Løvhøiden, Z, Majka, A, Makeev, B, McBreen, M, Mikelsen, M, Murray, J, Natowitz, B, Neumann, B S, Nielsen, J, Norris, D, Ouerdane, R, Płaneta, F, Rami, C, Ristea, O, Ristea, D, Röhrich, B H, Samset, D, Sandberg, S J, Sanders, R A, Scheetz, P, Staszel, T S, Tveter, F, Videbaek, R, Wada, Z, Yin, and I S, Zgura
Abstract: We present spectra of charged hadrons from Au+Au and d+Au collisions at sqrt[s(NN)]=200 GeV measured with the BRAHMS experiment at RHIC. The spectra for different collision centralities are compared to spectra from p+(-)p collisions at the same energy scaled by the number of binary collisions. The resulting ratios (nuclear modification factors) for central Au+Au collisions at eta=0 and eta=2.2 evidence a strong suppression in the high p(T) region (2 GeV/c). In contrast, the d+Au nuclear modification factor (at eta=0) exhibits an enhancement of the high p(T) yields. These measurements indicate a high energy loss of the high p(T) particles in the medium created in the central Au+Au collisions. The lack of suppression in d+Au collisions makes it unlikely that initial state effects can explain the suppression in the central Au+Au collisions.
Published: 2003

45. Rapidity Dependence of Charged Antihadron to Hadron Ratios inAu+AuCollisions atsNN=200 GeV

Author: R. A. Scheetz, D. Sandberg, Calin Besliu, Stephen Sanders, J. I. Jørdre, F. Videbæk, Z. Majka, Tomasz Kozik, J.W. Olness, K. Olchanski, Christian Holm Christensen, T. M. Larsen, T. Keutgen, K. Hagel, A. Wieloch, I. S. Zgura, A. Makeev, H. Bøggild, D. Ouerdane, E. Jakobsen, Jongmin Lee, Ole Hansen, J. B. Natowitz, H. Ito, R. Płaneta, Peter Christiansen, E. Enger, J. Norris, R. Wada, J. J. Gaardhøje, Anders Holm, Ian Gardner Bearden, R. R. Debbe, Trine Spedstad Tveter, Fouad Rami, Alexandru Jipa, Y. K. Lee, Y. Blyakhman, D. R. Beavis, M. Mikelsen, F. Jundt, A. K. Holme, Z. Yin, C. Ristea, Gunnar Løvhøiden, B. Budick, Borge Svane Nielsen, E. J. Kim, M. Germinario, Michael D. Murray, C. Chasman, J. Cibor, Bjørn Hallvard Samset, C. E. Jørgensen, R. Karabowicz, P. Staszel, B. McBreen, and Dieter Røhrich
Subjects: Nuclear reaction, Physics, Particle physics, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Nuclear physics, Baryon, Pion, Antimatter, Rapidity, Nuclear Experiment, Nucleon
Abstract: We present ratios of the numbers of charged antihadrons to hadrons (pions, kaons, and protons) in Au+Au collisions at sqrt[s(NN)]=200 GeV as a function of rapidity in the range y=0-3. While the ratios at midrapidity are approaching unity, the K(-)/K(+) and p;/p ratios decrease significantly at forward rapidities. An interpretation of the results within the statistical model indicates a reduction of the baryon chemical potential from mu(B) approximately 130 MeV at y=3 to mu(B) approximately 25 MeV at y=0.
Published: 2003

46. Results from the BRAHMS experiment at RHIC

Author: Dieter Röhrich, I.G. Bearden, D. Beavis, C. Besliu, Y. Blyakhman, J. Brzychczyk, B. Budick, H. Bøggild, C. Chasman, C.H. Christensen, P. Christiansen, J. Cibor, R. Debbe, E. Enger, J.J. Gaardhøje, M. Germinario, K. Grotowski, K. Hagel, O. Hansen, A.K. Holme, H. Ito, E. Jakobsen, A. Jipa, J.I. Jordre, F. Jundt, C.E. Jørgensen, R. Karabowicz, T. Keutgen, E.J. Kim, T. Kozik, T.M. Larsen, J.H. Lee, Y.K. Lee, G. Løvhøiden, Z. Majka, A. Makeev, B. McBreen, M. Mikkelsen, M. Murray, J. Natowitz, B.S. Nielsen, J. Norris, K. Olchanski, D. Ouerdane, R. Planeta, F. Rami, D. Roehrich, B. Samset, D. Sandberg, S. Sanders, R.A. Sheetz, Z. Sosin, P. Staszel, T.S. Tveter, F. Videbaek, R. Wada, A. Wieloch, Z. Yin, and I.S. Zgura
Published: 2003

47. Rapidity dependence of charged antihadron to hadron ratios in Au+Au collisions at $\sqrt{S_{NN}}$=200GeV

Author: I G, Bearden, D, Beavis, C, Besliu, Y, Blyakhman, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, E, Enger, J J, Gaardhøje, M, Germinario, K, Hagel, O, Hansen, A, Holm, A K, Holme, H, Ito, E, Jakobsen, A, Jipa, F, Jundt, J I, Jørdre, C E, Jørgensen, R, Karabowicz, T, Keutgen, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, G, Løvhøiden, Z, Majka, A, Makeev, B, McBreen, M, Mikelsen, M, Murray, J, Natowitz, B S, Nielsen, J, Norris, K, Olchanski, J, Olness, D, Ouerdane, R, Płaneta, F, Rami, C, Ristea, D, Röhrich, B H, Samset, D, Sandberg, S J, Sanders, R A, Scheetz, P, Staszel, T S, Tveter, F, Videbaek, R, Wada, A, Wieloch, Z, Yin, I S, Zgura, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and BRAHMS
Subjects: [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Abstract: We present ratios of the numbers of charged antihadrons to hadrons (pions, kaons, and protons) in Au+Au collisions at sqrt[s(NN)]=200 GeV as a function of rapidity in the range y=0-3. While the ratios at midrapidity are approaching unity, the K(-)/K(+) and p;/p ratios decrease significantly at forward rapidities. An interpretation of the results within the statistical model indicates a reduction of the baryon chemical potential from mu(B) approximately 130 MeV at y=3 to mu(B) approximately 25 MeV at y=0.
Published: 2003

48. Pseudorapidity Distributions of Charged Particles fromAu+AuCollisions at the Maximum RHIC Energy,sNN=200GeV

Author: E. Enger, J. H. Lee, A. Jipa, R. Wada, Ian Gardner Bearden, Anders Holm, B. McBreen, Borge Svane Nielsen, Michael Murray, Christian Holm Christensen, C. Chasman, Trine Spedstad Tveter, D. Beavis, R. Debbe, D. Sandberg, Y. Blyakhman, Y. K. Lee, R. Karabowicz, H. Ito, Ole Hansen, C. E. Jørgensen, J. Cibor, B. H. Samset, R. Płaneta, J. Norris, M. Mikelsen, T. Keutgen, P. Staszel, F. Videbaek, J. Natowitz, Peter Christiansen, A. Wieloch, R. A. Sheetz, K. Hagel, T. F. Thorsteinsen, J. I. Jørdre, E. Jakobsen, T. Kozik, K. Olchanski, T. M. Larsen, Catalin-Lucian Ristea, H. Bøggild, D. Ouerdane, J. Olness, Z. Majka, S. J. Sanders, A. K. Holme, B. Budick, C. Besliu, A. Makeev, F. Jundt, F. Rami, G. Løvhøiden, D. Röhrich, J. J. Gaardhøje, E. J. Kim, and I. S. Zgura
Subjects: Physics, Nuclear reaction, Particle physics, Pseudorapidity, Physics::Medical Physics, General Physics and Astronomy, Production (computer science), Atomic physics, Nuclear Experiment, Nucleon, Centrality, Energy (signal processing), Charged particle
Abstract: We present charged-particle multiplicities as a function of pseudorapidity and collision centrality for the ${}^{197}\mathrm{Au}{+}^{197}\mathrm{Au}$ reaction at $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}200\mathrm{GeV}$. For the $5%$ most central events we obtain ${\mathrm{dN}}_{\mathrm{ch}}/d\ensuremath{\eta}{|}_{\ensuremath{\eta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}625\ifmmode\pm\else\textpm\fi{}55$ and ${N}_{\mathrm{ch}}{|}_{\ensuremath{-}4.7\ensuremath{\le}\ensuremath{\eta}\ensuremath{\le}4.7}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4630\ifmmode\pm\else\textpm\fi{}370$, i.e., $14%$ and $21%$ increases, respectively, relative to $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}130\mathrm{GeV}$ collisions. Charged-particle production per pair of participant nucleons is found to increase from peripheral to central collisions around midrapidity. These results constrain current models of particle production at the highest RHIC energy.
Published: 2002

49. Pseudorapidity distributions of charged particles from Au + Au collisions at the maximum RHIC energy, square root[s(NN)] = 200 GeV

Author: I G, Bearden, D, Beavis, C, Besliu, Y, Blyakhman, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, E, Enger, J J, Gaardhøje, K, Hagel, O, Hansen, A, Holm, A K, Holme, H, Ito, E, Jakobsen, A, Jipa, J I, Jørdre, F, Jundt, C E, Jørgensen, R, Karabowicz, T, Keutgen, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, G, Løvhøiden, Z, Majka, A, Makeev, B, McBreen, M, Mikelsen, M, Murray, J, Natowitz, B S, Nielsen, J, Norris, K, Olchanski, J, Olness, D, Ouerdane, R, Płaneta, F, Rami, C, Ristea, D, Röhrich, B H, Samset, D, Sandberg, S J, Sanders, R A, Sheetz, P, Staszel, T F, Thorsteinsen, T S, Tveter, F, Videbaek, R, Wada, A, Wieloch, and I S, Zgura
Abstract: We present charged-particle multiplicities as a function of pseudorapidity and collision centrality for the 197Au+197Au reaction at square root[s(NN)] = 200 GeV. For the 5% most central events we obtain dN(ch)/deta/(eta = 0) = 625+/-55 and N(ch)/(-4.7or =etaor =4.7) = 4630 +/- 370, i.e., 14% and 21% increases, respectively, relative to square root[s(NN)] = 130 GeV collisions. Charged-particle production per pair of participant nucleons is found to increase from peripheral to central collisions around midrapidity. These results constrain current models of particle production at the highest RHIC energy.
Published: 2001

50. Rapidity Dependence of Antiproton-to-Proton Ratios inAu+AuCollisions atsNN=130GeV

Author: T. Keutgen, E. Jakobsen, Jongmin Lee, D. Ouerdane, Fouad Rami, P. Staszel, Zbigniew Sosin, A. Makeev, C. Chasman, R. Wada, H. Ito, Michael Murray, Alexandru Jipa, T.F. Thorsteinsen, J. Cibor, J. B. Natowitz, F. Jundt, Ian Gardner Bearden, J.W. Olness, Y. Blyakhman, Peter Christiansen, Bjørn Hallvard Samset, E. J. Kim, B. Budick, A. K. Holme, J. Brzychczyk, Christian Holm Christensen, K. Olchanski, Borge Svane Nielsen, C. E. Jørgensen, I. S. Zgura, R. A. Sheetz, Z. Majka, Dieter Røhrich, Calin Besliu, Anders Holm, H. Bøggild, Trine Spedstad Tveter, J. I. Jørdre, R. Płaneta, Gunnar Løvhøiden, Ole Hansen, Y. K. Lee, Tomasz Kozik, R. R. Debbe, Stephen Sanders, K. Hagel, B. McBreen, K. Grotowski, T. M. Larsen, D. R. Beavis, A. Wieloch, F. Videbæk, and J. J. Gaardhøje
Subjects: Physics, Range (particle radiation), Proton, Degree (graph theory), General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, Antiproton, Transverse momentum, High Energy Physics::Experiment, Rapidity, Astrophysics::Earth and Planetary Astrophysics, Atomic physics, Nuclear Experiment, Centrality, Bar (unit)
Abstract: Measurements, with the BRAHMS detector, of the antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions at s{sub NN}=130 GeV , and for three different collision centralities. For collisions in the 0%--40% centrality range, we find N({bar p})/N(p)=0.64{+-} 0.04{sub (stat)}{+-}0.06{sub ( syst)} at y{approx}0 , 0.66{+-}0.03{+-}0.06 at y{approx}0.7 , and 0.41{+-}0.04{+-}0.06 at y{approx}2 . The ratios are found to be nearly independent of collision centrality and transverse momentum. The antiproton and proton rapidity densities vary differently with rapidity, and indicate a significant degree of collision transparency, although a net-baryon free midrapidity plateau (Bjorken limit) is not yet reached.
Published: 2001

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